Suppose there is a right triangle. Sine is the height divided by the hypotenuse, and cosine is the base divided by the hypotenuse.

Sine is often notated as *sin*, and cosine as *cos*.

*sin0 = 0**sin30 = ½**sin90 = 1*

*cos0 = 1**cos30 = ½√3**cos90 = 0*

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